The dihedral angle of two planes can be seen by looking at the planes "edge on", i.e., along their line of intersection. The dihedral angle ?AB between two planes denoted A and B is the angle between their two normal unit vectors A dihedral angle can be signed; for example, the dihedral angle ?AB can be defined as the angle through which plane A must be rotated to align it with plane B. Thus, ?AB = ? ?BA. For precision, one should specify the angle or its supplement, since both rotations will cause the planes to coincide.

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